I have a problem that I can't seem to find the settings to modify.

When attempting to find the GLUT package using CLion's CMake utilities on Ubuntu, it does not find GLUT. Using command-line CMake and Makefile commands, however, finds the dependencies perfectly and allows the following to generate and compile:

# CMakeLists.txt
cmake_minimum_required(VERSION 3.16)
project(mre)

set(CMAKE_CXX_STANDARD 20)

find_package(OpenGL REQUIRED) # Works in CLion and terminal
find_package(GLUT REQUIRED) # Works only in terminal
include_directories(GL)

add_executable(mre mre.cpp)
target_link_libraries(mre -lglut -lGLU -lGL)

// mre.cpp
#include <GL/gl.h>
#include <GL/glut.h>

int main()
{
    return 0;
}

Whereas attempting to use these files in a CLion project would cause errors (first unable to find GLUT, mitigated by manually setting library and include variables; then GL/glut.h: No such file or directory, which I am unable to fix).

Does anyone have any suggestions? I'm assuming it's something to do with a working directory or prefixes, but CMAKE_PREFIX_PATH is unset in CLion, and setting it to various values does nothing to solve the problem.

Thanks!

CodePudding user response：

You know something has gone wrong when you write include_directories or -l flags by hand. You should absolutely always link to libraries via their imported targets.

See the documentation:

OpenGL package: https://cmake.org/cmake/help/latest/module/FindOpenGL.html
GLUT package: https://cmake.org/cmake/help/latest/module/FindGLUT.html

Try this revision:

cmake_minimum_required(VERSION 3.16)
project(mre)

find_package(OpenGL REQUIRED)
find_package(GLUT REQUIRED)

add_executable(mre mre.cpp)
target_link_libraries(mre PRIVATE OpenGL::GL OpenGL::GLU GLUT::GLUT)
target_compile_features(mre PRIVATE cxx_std_20)

As for not being able to find GLUT... just set CMAKE_PREFIX_PATH in CLion's settings to whichever directory on your system contains include/GL/glut.h.

CodePudding user response：

Alternative solution

CLion was installed through the Software Center via Flatpak, which uses some kind of filesystem sandboxing that may be interfering with paths. I tried explicitly allowing /usr and related paths, but had no effect.

I have reinstalled via JetBrains's official archive, which correctly detects GLUT and OpenGL. Their official snap also works properly.